Richard

Method 1:

Lower the second stage into a bowl of water, mouthpiece up.  Note the point
where it starts to give air.  Measure the distance from diaphragm to this
point.  This is the cracking pressure of the second stage.  You have to work
out where the diaphragm is so this method is not so good.  Also if water
gets inside the mouth piece then a 
false reading is given.

Cost $0.

Method 2:

Buy yourself a 24" section of clear plastic pipe, the sort that is often
sold for siphon tubes for brewing, etc.  The thinner, the better.  Part fill
with water with the tube held in a "U" shape.  Have a rule to hand.  Insert
one end of the tube in mouth.  Also insert reg in mouth.  Inhale making sure
there are no leaks around your mouth.  Whilst inhaling slowly, measure the
difference in height of water in the tube.  This is the cracking pressure of
the second stage.

Likely cost $1.

Method 3:

Get and old mouthpiece and make a small hole in it to take the end of the
tube from Method 2.  Ensure there are no leaks around the hole/tube
interface.  Remove mouthpiece from reg and insert test mouthpiece.  Breath
from test mouthpiece and proceed as for Method 2.  This should be easier
than juggling with tubes and mouth pieces.

David Shimell
Project Manager, Sequent Computer Systems Ltd., Weybridge, UK
Email: shimell@se*.co*


-----Original Message-----
From:	Richard Hayward [SMTP:hddiver@ic*.ne*]
Sent:	Sunday, March 22, 1998 9:35 PM
To:	techdiver
Subject:	Reg Test Bench

Hey I was just looking through my dealer catalogues and was noticing that
the regulator test bench was a $1500.00 dollar item, now either this was
marked improperly or is extremely overpriced.

Anyway I am sure some crafty person out there has made one themselves and
saved themselves a bundle. I was just wondering if they would be willing to
share their plans or methods.

In case you dont know what I am talking about it is for the setting up and
tuning of regs usually has a magnahelix (measuring cracking effort)
intermediate pressure guage etc.

Thanks everyone in advance.

Richard Hayward

"That which does not kill you, only makes you stranger" Peter Chung (yes
stranger)

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